From: Shu Wang <shuwang@xxxxxxxxxx> Found this issue by kmemleak, a few kb mem was leaked in megasas_alloc_cmdlist_fusion when kzalloc failed for one megasas_cmd_fusion allocation. unreferenced object 0xffff88045dbd2000 (size 8192): comm "systemd-udevd", pid 323, jiffies 4294671759 (age 49.008s) backtrace: [<ffffffff8176166a>] kmemleak_alloc+0x4a/0xa0 [<ffffffff812186a8>] __kmalloc+0xe8/0x220 [<ffffffffc0060594>] megasas_alloc_cmdlist_fusion+0x34/0xe0 [megaraid_sas] (gdb) list *megasas_alloc_cmdlist_fusion+0x34 0xd5c4 is in megasas_alloc_cmdlist_fusion (drivers/scsi/megaraid/megaraid_sas_fusion.c:443). [<ffffffffc0060ca5>] megasas_alloc_cmds_fusion+0x25/0x410 [megaraid_sas] [<ffffffffc0061edf>] megasas_init_adapter_fusion+0x21f/0x640 [megaraid_sas] [<ffffffffc005df17>] megasas_init_fw+0x357/0xd30 [megaraid_sas] [<ffffffffc005ef26>] megasas_probe_one.part.33+0x636/0x1100 [megaraid_sas] [<ffffffffc005fa36>] megasas_probe_one+0x46/0xc0 [megaraid_sas] [<ffffffff813d2ca5>] local_pci_probe+0x45/0xa0 [<ffffffff813d4222>] pci_device_probe+0x192/0x1b0 [<ffffffff814e3658>] driver_probe_device+0x2a8/0x460 [<ffffffff814e38ed>] __driver_attach+0xdd/0xe0 [<ffffffff814e124c>] bus_for_each_dev+0x6c/0xc0 [<ffffffff814e2dde>] driver_attach+0x1e/0x20 [<ffffffff814e2775>] bus_add_driver+0x45/0x270 [<ffffffff814e4400>] driver_register+0x60/0xe0 unreferenced object 0xffff880454ce3600 (size 192): backtrace: [<ffffffff8176166a>] kmemleak_alloc+0x4a/0xa0 [<ffffffff8121801a>] kmem_cache_alloc_trace+0xca/0x1d0 [<ffffffffc00605d7>] megasas_alloc_cmdlist_fusion+0x77/0xe0 [megaraid_sas] (gdb) list *megasas_alloc_cmdlist_fusion+0x77 0xd607 is in megasas_alloc_cmdlist_fusion (drivers/scsi/megaraid/megaraid_sas_fusion.c:450). [<ffffffffc0060ca5>] megasas_alloc_cmds_fusion+0x25/0x410 [megaraid_sas] [<ffffffffc0061edf>] megasas_init_adapter_fusion+0x21f/0x640 [megaraid_sas] [<ffffffffc005df17>] megasas_init_fw+0x357/0xd30 [megaraid_sas] [<ffffffffc005ef26>] megasas_probe_one.part.33+0x636/0x1100 [megaraid_sas] [<ffffffffc005fa36>] megasas_probe_one+0x46/0xc0 [megaraid_sas] [<ffffffff813d2ca5>] local_pci_probe+0x45/0xa0 [<ffffffff813d4222>] pci_device_probe+0x192/0x1b0 [<ffffffff814e3658>] driver_probe_device+0x2a8/0x460 [<ffffffff814e38ed>] __driver_attach+0xdd/0xe0 [<ffffffff814e124c>] bus_for_each_dev+0x6c/0xc0 [<ffffffff814e2dde>] driver_attach+0x1e/0x20 [<ffffffff814e2775>] bus_add_driver+0x45/0x270 [<ffffffff814e4400>] driver_register+0x60/0xe0 Signed-off-by: Shu Wang <shuwang@xxxxxxxxxx> --- drivers/scsi/megaraid/megaraid_sas_fusion.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index f990ab4d..9855106 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -425,7 +425,7 @@ static int megasas_create_sg_sense_fusion(struct megasas_instance *instance) int megasas_alloc_cmdlist_fusion(struct megasas_instance *instance) { - u32 max_mpt_cmd, i; + u32 max_mpt_cmd, i, j; struct fusion_context *fusion; fusion = instance->ctrl_context; @@ -450,11 +450,15 @@ megasas_alloc_cmdlist_fusion(struct megasas_instance *instance) fusion->cmd_list[i] = kzalloc(sizeof(struct megasas_cmd_fusion), GFP_KERNEL); if (!fusion->cmd_list[i]) { + for (j = 0; j < i; j++) + kfree(fusion->cmd_list[j]); + kfree(fusion->cmd_list); dev_err(&instance->pdev->dev, "Failed from %s %d\n", __func__, __LINE__); return -ENOMEM; } } + return 0; } int -- 2.5.0